US9010418B2 - Sucker rod guide - Google Patents

Sucker rod guide Download PDF

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Publication number
US9010418B2
US9010418B2 US13/280,444 US201113280444A US9010418B2 US 9010418 B2 US9010418 B2 US 9010418B2 US 201113280444 A US201113280444 A US 201113280444A US 9010418 B2 US9010418 B2 US 9010418B2
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Prior art keywords
rod
planar surface
rod guide
blade
angle
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US13/280,444
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US20130098601A1 (en
Inventor
Matias Pereyra
Alejandro Levrino
Bernardo Bouillard
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Tenaris Connections BV
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Tenaris Connections Ltd
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Priority to US13/280,444 priority Critical patent/US9010418B2/en
Assigned to TENARIS CONNECTIONS LIMITED reassignment TENARIS CONNECTIONS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEVRINO, ALEJANDRO, BOUILLARD, BERNARDO, PEREYRA, MATIAS
Priority to CA2792755A priority patent/CA2792755C/en
Priority to PE2012002072A priority patent/PE20131001A1/es
Priority to ECSP12012278 priority patent/ECSP12012278A/es
Priority to MX2012012424A priority patent/MX2012012424A/es
Priority to CO12189591A priority patent/CO6930063A1/es
Priority to ARP120103981A priority patent/AR088516A1/es
Priority to ROA201200754A priority patent/RO128519B1/ro
Priority to BR102012027414-0A priority patent/BR102012027414B1/pt
Publication of US20130098601A1 publication Critical patent/US20130098601A1/en
Priority to US14/681,818 priority patent/US9926754B2/en
Publication of US9010418B2 publication Critical patent/US9010418B2/en
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Assigned to TENARIS CONNECTIONS B.V. reassignment TENARIS CONNECTIONS B.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TENARIS CONNECTIONS LIMITED
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/22—Handling reeled pipe or rod units, e.g. flexible drilling pipes
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1042—Elastomer protector or centering means
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1071—Wear protectors; Centralising devices, e.g. stabilisers specially adapted for pump rods, e.g. sucker rods

Definitions

  • This disclosure relates generally to the field of guides for sucker rod strings and, more particularly, to a rod guide with a polygonal body and a plurality of blades.
  • Rod guides for centralizing sucker rods within production tubing are well known in the art.
  • a pumping unit 8 has attached thereto a polish rod 9 .
  • the polish rod 9 is attached longitudinally to a sucker rod 10 disposed inside of a tubing (T) which is disposed in a casing string (C).
  • a reciprocating pump (not shown).
  • the barrel of the reciprocating pump fills with the production fluid to be produced.
  • a valve in the reciprocating pump shuts and the production fluid in the pump barrel is lifted, displacing production fluid above it and forcing one pump-barrel's worth of production fluid out of the hole.
  • the sucker rod must extend from the pumping unit all the way down to the reciprocating pump, which may be several thousand feet below the surface. Consequently, the sucker rod is subjected to a variety of stresses: compression, tension, torsion, and bending.
  • the rod is prevented from moving sideways or wobbling by the installation of periodic rod guides 12 , 14 on the rod 10 thereby controlling rod and tubing wear.
  • the rod guides typically have a number of vanes, fins or blades which extend radially and centralize the rod within the cylindrical tubing. This prevents the rod from wearing or from other damage. Any wear will, thus, occur to the rod guide fins.
  • the rod guides may be fabricated from various materials, such as synthetic materials which are oil-resistant and resistant to abrasion.
  • the cross-sectional area of the fins/blades/vanes may be maximized for maximum wear life.
  • sucker rod guides include a body that is molded in intimate contact with the sucker rod.
  • the body has simultaneously molded therewith a plurality of “fins”, “blades” or “vanes” that extend radially from the body.
  • Cross-sections of some prior art rod guides 12 and 14 are illustrated in FIGS. 1A and 1B .
  • the present disclosure describes and illustrates a polymeric rod guide 26 for a sucker rod 10 .
  • the polymeric rod guide includes: a body 28 surrounding and coaxial with the sucker rod, said body having a polygonal cross-section molded in fixed contact with the sucker rod.
  • the guide further includes a plurality of blades 30 longitudinally disposed and extending from the body 28 , each blade having a pair of planar longitudinal side walls 40 and an exterior longitudinal edge 24 , each of said blades having a first blade face 22 disposed between a first terminal end 23 of the blade and the exterior longitudinal edge 24 and a second blade face 22 disposed between a second terminal end 25 of the blade and the exterior longitudinal edge 24 , and an area of the body between the longitudinal side wall 40 of a first blade and the longitudinal side wall 40 of an adjacent second blade defines a trough 32 having a plurality of planar surfaces 32 a , 32 b , 32 c.
  • the rod guide 26 further includes a first curved lead section 34 molded integral with the body 28 .
  • the lead section being disposed longitudinally about the rod and terminating at a first end on an outer surface of the rod and being disposed at a second end in integral contact with the body 28 .
  • the lead section having a curved surface 35 with a radius of curvature of between 20 and 22 mm.
  • the first curved lead section 34 has an outer curved surface 35 that extends from the rod to the body.
  • the curved surface defined by a tangent to the mid-point of the curved surface having an angle of between 5 and 20 degrees measured between a line parallel to the longitudinal axis of the rod and the tangent to the curved surface 35 of the lead section 34 .
  • the rod guide 26 includes 4 blades circumferentially disposed 90 degrees about the guide body 28 .
  • the exterior longitudinal edge 24 of the rod guide 26 has a convex curved surface with a radius of curvature being a same radius of curvature as an inner surface of a tube (T) into which the rod and rod guide is to be used.
  • the trough 32 between the longitudinal side walls includes: a first planar surface 32 a that tapers away from the first terminal end 23 of the blade face 22 at an angle (a 1 ) measured between a line parallel to the longitudinal axis of the rod and the first planar surface (a), a second planar surface 32 b disposed adjacent to the first planar surface (a), and a third planar surface 32 c disposed adjacent to the second planar surface, said third planar surface tapers away from the second terminal end 25 of the blade face 22 at an angle (c 1 ) measured between a line parallel to the longitudinal axis of the rod and the third planar surface 32 c .
  • the angle (a 1 ) is generally less than or equal to 15 degrees
  • the second planar surface is generally parallel to the axis of the rod
  • the angle (c 1 ) is less than or equal to 15 degrees.
  • the angle (a 1 ) is less than or equal to 4 degrees
  • the second planar surface is generally parallel to the axis of the rod
  • the angle (c 1 ) is less than or equal to 4 degrees.
  • the blade face 22 comprises a curved surface that extends from the first terminal end 23 of the blade to the exterior longitudinal edge 24 , said curved surface defined by a tangent to the mid-point of the curved surface having an angle of in the range of 10 to 40 degrees measured between a line parallel to the longitudinal axis of the rod and the tangent to the curved surface of the blade face 22 .
  • the blade face 22 includes a curved surface that extends from the first terminal end 23 to the exterior longitudinal edge 24 , said curved surface having a radius of curvature of in the range of 20 to 22 mm.
  • the second planar surface 32 b has a first predetermined longitudinal length (Lb) parallel to the axis of the rod, the first planar surface 32 a and the third planar surface 32 c each have a longitudinal length (La, Lc) greater than the longitudinal length (Lb) of planar surface (b).
  • the longitudinal length of the first planar surface 32 a and third planar surface 32 c is between 55 to 75 mm and the second planar surface 32 b has a longitudinal length of between 0 and 30 mm.
  • the longitudinal length (Lb) of the second planar surface 32 b can be at least twice a width of the second planar surface 32 b.
  • a polymeric rod guide 126 for a sucker rod 110 includes a body 128 surrounding and coaxial with the sucker rod.
  • the body has a polygonal cross-section molded in fixed contact with the sucker rod; a plurality of blades 130 longitudinally disposed and extending from the body 128 ; each blade having a pair of longitudinal side walls 140 , each of said longitudinal side walls having a first planar surface 140 a that tapers away from the first terminal end 123 of the blade face 122 at an angle (a′) measured between a line parallel to the longitudinal axis of the rod and the first planar surface, a second planar surface 140 b disposed adjacent to the first planar surface, and a third planar surface 140 c disposed adjacent to the second planar surface, said third planar surface 140 c tapering away from the second terminal end 125 of the blade face 122 at an angle (c′) measured between a line parallel to the longitudinal axis of the rod and the third planar surface 140 c .
  • Each blade has an exterior longitudinal edge 124 and each of the blades has a first blade face 122 disposed between a first terminal end 123 of the blade and the exterior longitudinal edge 124 , and a second blade face 122 disposed between a second terminal end 125 of the blade and the exterior longitudinal edge 124 .
  • the area of the body between the longitudinal side wall of a first blade and the longitudinal side wall of an adjacent second blade defines a trough 132 having a plurality of planar surfaces 132 a , 132 b , 132 c.
  • the angle (a′) is less than 15 degrees
  • the second planar surface is generally perpendicular to the axis of the rod
  • the angle (c′) is less than 15 degrees
  • the angle (a′) is less than or equal to 4 degrees
  • the second planar surface is generally perpendicular to the axis of the rod
  • the angle (c′) is less than or equal to 4 degrees.
  • the second planar surface 140 b has a first predetermined longitudinal length (Lb′) parallel to the axis of the rod, the first planar surface 140 a and the third planar surface 140 c each have a longitudinal length (La′, Lc′) greater than the longitudinal length (Lb′) of planar surface 140 b.
  • the longitudinal length of the first planar surface 140 a and third planar surface 140 c is between 55 to 75 mm and the second planar surface 140 b has a longitudinal length of between 0 and 30 mm.
  • the longitudinal length (Lb′) of the second planar section 140 b is at least twice a width of the second planar section 140 b.
  • the rod guide 126 further includes a first curved lead section 134 molded integral with the body 128 .
  • the lead section is disposed longitudinally about the rod and terminating at a first end on an outer surface of the rod and disposed at a second end in integral contact with the body 128 .
  • the lead section has a curved surface 135 with a radius of curvature of between 20 and 22 mm.
  • the curved surface defined by a tangent to the mid-point of the curved surface having an angle of between 5 and 20 degrees measured between a line parallel to the longitudinal axis of the rod and the tangent to the curved surface 135 of the lead section 34 .
  • the rod guide 126 includes 4 blades circumferentially disposed 90 degrees about the guide body 128 .
  • the exterior longitudinal edge 124 of the rod guide 126 has a convex curved surface with a radius of curvature being a same radius of curvature as an inner surface of a tube (T) into which the rod and rod guide is to be used.
  • the trough 132 between the longitudinal side walls includes: a first planar surface 132 a that tapers away from the first terminal end 123 of the blade face 122 at an angle (a 1 ) measured between a line parallel to the longitudinal axis of the rod and the first planar surface 132 a , a second planar surface 132 b disposed adjacent to the first planar surface 132 a , a third planar surface 132 c disposed adjacent to the second planar surface 132 b , said third planar surface 132 c tapers away from the second terminal end 125 of the blade face 122 at an angle (c 1 ) measured between a line parallel to the longitudinal axis of the rod and the third planar surface 132 c .
  • the angle (a 1 ) is less than or equal to 4 degrees
  • the second planar surface is generally parallel to the axis of the rod
  • the angle (c 1 ) is less than or equal to 4 degrees.
  • the blade face 122 comprises a curved surface that extends from the first terminal end 123 of the blade to the exterior longitudinal edge 124 .
  • the curved surface defined by a tangent to the mid-point of the curved surface having an angle of in the range of 10 to 40 degrees measured between a line parallel to the longitudinal axis of the rod and the tangent to the curved surface of the blade face 122 .
  • the blade face 122 includes a curved surface that extends from the first terminal end 123 to the exterior longitudinal edge 124 .
  • the second planar surface 132 b has a first predetermined longitudinal length (Lb) parallel to the axis of the rod, the first planar surface 132 a and the third planar surface 132 c each have a longitudinal length (La, Lc) greater than the longitudinal length (Lb) of planar surface 132 b .
  • the longitudinal length of the first planar surface 132 a and third planar surface 132 c is in the range of 55 to 75 mm and the second planar surface 132 b has a longitudinal length of in the range of 0 to 30 mm.
  • the longitudinal length (Lb) of the second planar surface 132 b is at least twice a width of the second planar surface 132 b.
  • the rod guide 26 may be installed in a sucker rod in a method comprising: molding a unitary rod guide coaxial about and in fixed contact with the sucker rod, said guide comprising a body portion 28 surrounding and coaxial with the sucker rod, said body having a plurality of blades 30 longitudinally disposed and extending from the body 28 , each blade having a pair of planar longitudinal side walls 40 and an exterior longitudinal edge 24 , each of said blades having a first blade face 22 disposed between a first terminal end 23 of the blade and the exterior longitudinal edge 24 and a second blade face 22 disposed between a second terminal end 25 of the blade and the exterior longitudinal edge 24 , and an area of the body between the longitudinal side wall 40 of a first blade and the longitudinal side wall 40 of an adjacent second blade defines a trough 32 having a plurality of planar surfaces 32 a , 32 b , 32 c.
  • the method may further include concurrently molding a first lead section 34 integral with the body 28 , said lead section disposed longitudinally about the rod and terminating at a first end on an outer surface of the rod and disposed at a second end in contact with the body 28 , said lead section having a curved surface 35 with a radius of curvature of between 20 and 22 mm and said curved surface further defined by a tangent to the mid-point of the curved surface having an angle of between 5 and 20 degrees measured between a line parallel to the longitudinal axis of the rod and the tangent to the curved surface 35 of the lead section 34 .
  • the method may further include preparing a section of the rod 10 by placing an epoxy based glue on a predetermined portion of the rod 10 and placing particles having a diameter in the range of 0.71 to 1.18 mm onto the epoxy glue; and direct injection molding the rod guide 26 , 126 about at least a portion of the prepared section of the rod.
  • the rod guide 126 may be installed on a sucker rod in a method comprising: molding a unitary rod guide coaxial about and in fixed contact with the sucker rod, said guide comprising a body portion 28 surrounding and coaxial with the sucker rod, said body having a plurality of blades 30 longitudinally disposed and extending from the body 28 , each blade having a pair of longitudinal side walls 140 , each of said longitudinal side walls having a first planar surface 140 a that tapers away from the first terminal end 123 of the blade face 122 at an angle (a′) measured between a line parallel to the longitudinal axis of the rod and the first planar surface, a second planar surface 140 b disposed adjacent to the first planar surface, and a third planar surface 140 c disposed adjacent to the second planar surface, said third planar surface 140 c tapers away from the second terminal end 125 of the blade face 122 at an angle (c′) measured between a line parallel to the longitudinal axis of the rod and the third planar surface 140 c
  • the method of may further include concurrently molding a first curved lead section 34 integral with the body 28 , said lead section disposed longitudinally about the rod and terminating at a first end on an outer surface of the rod and disposed at a second end in contact with the body 28 , said lead section having a curved surface 35 with a radius of curvature of between 20 and 22 mm and said curved surface further defined by a tangent to the mid-point of the curved surface having an angle of between 5 and 20 degrees measured between a line parallel to the longitudinal axis of the rod and the tangent to the curved surface 35 of the lead section 34 .
  • the method may further include: preparing a section of the rod 10 by placing an epoxy based glue on a predetermined portion of the rod 10 and placing particles having a diameter between 0.71 and 1.18 mm onto the epoxy glue; and direct injection molding the rod guide 26 , 126 about at least a portion of the prepared section of the rod.
  • FIG. 1 is prior art pumping system illustrating a prior art rod guide disposed inside a tubing string
  • FIG. 1A is a transverse cross-section of a prior art rod guide
  • FIG. 1B is a transverse cross-section of a prior art rod guide
  • FIG. 2 is a side view of a first embodiment of a rod guide of the present disclosure illustrated inside a cross-section of tubing;
  • FIG. 2A is a transverse cross-section of the rod guide of FIG. 2 taken at section AA;
  • FIG. 2B is a transverse cross-section of the rod guide of FIG. 2 taken at section BB;
  • FIG. 3 is a perspective view of the rod guide of FIG. 2 ;
  • FIG. 4 is a partial side view of the rod guide of FIG. 2 partially rotated forward to illustrate planar surfaces 32 a , 32 b and 32 c of blade 30 ;
  • FIG. 4A is a transverse section view illustrating the trough 32 between the blades 30 of the rod guide of FIG. 4 ;
  • FIG. 5 is a side view of a second embodiment of a rod guide of the present disclosure illustrated inside a cross-section of tubing;
  • FIG. 5A is a transverse cross-section of the rod guide of FIG. 5 taken at section AA;
  • FIG. 5B is a transverse cross-section of the rod guide of FIG. 5 taken at section BB;
  • FIG. 6 is a perspective view of the rod guide of FIG. 5 ;
  • FIG. 7 is a partial side view of the rod guide of FIG. 5 partially rotated forward to illustrate planar surfaces 132 a , 132 b and 132 c and 140 a , 140 b and 140 c of blade 30 ;
  • FIG. 7A is a transverse section view illustrating the trough 132 between the blades 130 of the rod guide of FIG. 7 .
  • blade refers to the molded portion of the rod guide that extends from the body and may guidingly contact the interior surface of production tubing.
  • the polymeric rod guide 26 includes a body 28 surrounding and coaxial with the sucker rod.
  • the body includes a polygonal cross-section molded in fixed contact with the sucker rod.
  • a plurality of blades 30 are longitudinally disposed and extend from the body 28 , each blade having a pair of planar longitudinal side walls 40 and an exterior longitudinal edge 24 .
  • Each of said blades has a first blade face 22 disposed between a first terminal end 23 of the blade and the exterior longitudinal edge 24 and a second blade face 22 disposed between a second terminal end 25 of the blade and the exterior longitudinal edge 24 .
  • An area of the body between the longitudinal side wall 40 of a first blade and the longitudinal side wall 40 of an adjacent second blade defines a trough 32 having a plurality of planar surfaces 32 a , 32 b , 32 c.
  • the rod guide 26 further includes first generally curved lead section 34 molded integral with the body 28 .
  • the lead section is disposed longitudinally about the rod and terminating at a first end on an outer surface of the rod and at a second end at each of the first terminal ends 23 , 25 of each blade and at a terminal end of each trough 32 between each blade 30 .
  • the lead section 34 has an outer surface 35 that extends from the rod to the body 28 .
  • the outer curved surface 35 has a small radius of curvature of between 20 and 22 mm.
  • the taper of the curved surface 35 is defined by a tangent to the mid point of the curve having an angle of between 5 and 20 as measured between the tangent and a line parallel to the longitudinal axis of the rod and the curved surface of the lead section 34 .
  • the angle of the tangent is 15 degrees.
  • the rod guide 26 includes four blades 30 circumferentially disposed 90 degrees about the guide body 28 .
  • the exterior longitudinal edge 24 of the rod guide 26 has a convex curved surface with a radius of curvature being a same radius of curvature as an inner surface of a tube (T) into which the rod and rod guide is to be used.
  • the trough 32 between the longitudinal side walls 40 includes: a first planar surface 32 a that tapers away from the first terminal end 23 of the blade face 22 at an angle (a 1 ) measured between a line parallel to the longitudinal axis of the rod and the first planar surface 32 a , a second planar surface 32 b disposed adjacent to the first planar surface 32 a , and a third planar surface 32 c disposed adjacent to the second planar surface, said third planar surface tapers away from the second terminal end 25 of the blade face 22 at an angle (c 1 ) measured between a line parallel to the longitudinal axis of the rod and the third planar surface 32 c .
  • the angle (a 1 ) is less than 15 degrees
  • the second planar surface is generally parallel to the axis of the rod
  • the angle (c 1 ) is less than 15 degrees.
  • the angle (a 1 ) is less than or equal to 4 degrees
  • the second planar surface is generally parallel to the axis of the rod
  • the angle (c 1 ) is less than or equal to 4 degrees.
  • angle (a 1 ) angle (c 1 ).
  • the trough 32 includes three sections: Section (a): having an increasing taper (from the guide end to the center of the guide); Section (b): having a substantially cylindrical configuration; and Section (c): having a decreasing taper (from the center of the guide to the end of the guide).
  • the cross-section area 44 of the cavity for fluid passage formed between blades and tubing (T) is higher at the beginning of the sucker rod guide than in the middle of, and so providing a desired nozzle effect that will be explained hereinafter in the discussion of the advantages of the present design.
  • the blade face 22 comprises a curved surface having a small radius of curvature in the range of 20 to 22 mm.
  • the taper of the surface is defined by a tangent to the curved surface taken in the midpoint of the curve.
  • the angle of the tangent is between 10 and 40 degrees as measured between a line parallel to the longitudinal axis of the rod and the tangent to the curved surface of the blade face 22 .
  • the blade face 22 comprises a curved surface having a small radius of curvature in the range of 20 to 22 mm.
  • the taper of the surface is defined by a tangent to the curved surface taken in the midpoint of the curve.
  • the angle of the tangent is 32 degrees or less as measured between a line parallel to the longitudinal axis of the rod and the tangent to the curved surface of the blade face 22 .
  • the second planar surface 32 b of the rod guide 26 has a first predetermined longitudinal length (Lb) parallel to the axis of the rod, the first planar surface 32 a and the third planar surface 32 c each have a longitudinal length (La, Lc) greater than the longitudinal length (Lb) of planar surface 32 b .
  • the longitudinal length of the first planar surface 32 a and third planar surface 32 c is between 55 to 75 mm (preferably 65 mm) and the second planar surface 32 b has a longitudinal length of between 0 and 30 mm.
  • the longitudinal length (Lb) of the second planar surface 32 b is at least twice a width of the second planar surface ( 32 b ).
  • the polymeric rod guide 126 for a sucker rod 110 includes a body 128 surrounding and coaxial with the sucker rod.
  • the body has a polygonal cross-section molded in fixed contact with the sucker rod.
  • the lateral surfaces 140 of each blade 130 are also formed by tapered surfaces, 140 a , 140 b and 140 c .
  • the rod guide 126 includes a plurality of blades 130 longitudinally disposed and extending from the body 128 .
  • Each blade having a pair of longitudinal side walls 140 , each of said longitudinal side walls have a first planar surface 140 a that tapers away from the first terminal end 123 of the blade face 122 at an angle (a′) measured between a line parallel to the longitudinal axis of the rod and the first planar surface, a second planar surface 140 b disposed adjacent to the first planar surface, and a third planar surface 140 c disposed adjacent to the second planar surface, said third planar surface 140 c tapers away from the second terminal end 125 of the blade face 122 at an angle (c′) measured between a line parallel to the longitudinal axis of the rod and the third planar surface 140 c .
  • Each blade has an exterior longitudinal edge 124 .
  • Each blade has a first blade face 122 disposed between a first terminal end 123 of the blade and the exterior longitudinal edge 124 , and a second blade face 122 disposed between a second terminal end 125 of the blade and the exterior longitudinal edge 124 .
  • the angle (a′) is less than 15 degrees
  • the second planar surface is generally perpendicular to the axis of the rod
  • the angle (c′) is less than 15 degrees.
  • the angle (a′) is less than or equal to 4 degrees
  • the second planar surface is generally perpendicular to the axis of the rod
  • the angle (c′) is less than or equal to 4 degrees.
  • the lateral face 140 includes three sections: Section (a): having an increasing taper (from the guide end to the center of the guide); Section (b): having a substantially cylindrical configuration; and Section (c): having a decreasing taper (from the center of the guide to the end of the guide).
  • the second planar surface 140 b has a first predetermined longitudinal length (Lb′) parallel to the axis of the rod, the first planar surface 140 a and the third planar surface 140 c each have a longitudinal length (La′, Lc′) greater than the longitudinal length (Lb′) of planar surface (b).
  • the longitudinal length of the first planar surface 140 a and third planar surface 140 c is between 55 to 75 mm (preferably 65 mm) and the second planar surface 140 b has a longitudinal length of between 0 and 30 mm.
  • the longitudinal length (Lb′) of the second planar section 140 b is at least twice a width of the second planar section 140 b to stabilize the fluid.
  • the cross-section area 144 of the cavity for fluid passage formed between blades and tubing (T) is higher at the beginning of the sucker rod guide than in the middle of it, and so providing the desire nozzle effect that will be explained in the following section.
  • the guide further includes a first generally curved lead section 134 molded integral with the body 128 .
  • the lead section 134 is disposed longitudinally about the rod and terminating at a first end on an outer surface of the rod and at a second end at the body 128 .
  • the lead section 134 has a generally outer curved surface 135 that extends from the rod to the body 28 .
  • the outer surface 135 has a small radius of curvature of between 20 and 22 mm.
  • the taper of the curved surface 135 is defined by a tangent to the mid point of the curve having an angle of between 5 and 20 as measured between the tangent and a line parallel to the longitudinal axis of the rod and the curved surface of the lead section 34 . In the preferred embodiment the angle of the tangent is 15 degrees.
  • the plurality of blades 130 includes 4 blades circumferentially disposed 90 degrees about the guide body 128 .
  • the exterior longitudinal edge 124 has a convex curved surface with a radius of curvature being a same radius of curvature as an inner surface of a tube (T) into which the rod and rod guide is to be used.
  • an area of the body 128 between the longitudinal side wall 140 of a first blade and the longitudinal side wall of an adjacent second blade defines a trough 132 having a plurality of planar surfaces 132 a , 132 b , 132 c .
  • the trough 132 between the longitudinal side walls includes: a first planar surface 132 a that tapers away from the first terminal end 123 of the blade face 122 at an angle (a 1 ) measured between a line parallel to the longitudinal axis of the rod and the first planar surface (a), a second planar surface 132 b disposed adjacent to the first planar surface 132 a , a third planar surface 132 c disposed adjacent to the second planar surface 132 b , said third planar surface 132 c tapers away from the second terminal end 125 of the blade face 122 at an angle (c 1 ) measured between a line parallel to the longitudinal axis of the rod and the third planar surface (c).
  • the angle (a 1 ) is less than or equal to 4 degrees
  • the second planar surface is generally parallel to the axis of the rod
  • the angle (c 1 ) is less than or equal to 4 degrees.
  • angle a 1 angle a 2
  • the trough 132 includes three sections: Section (a): having an increasing taper (from the guide end to the center of the guide; Section (b): having a substantially cylindrical configuration; and Section (c): having a decreasing taper (from the center of the guide to the end of the guide). As illustrated in FIGS.
  • the cross-section area 144 of the cavity for fluid passage formed between blades and tubing (T) is higher at the beginning of the sucker rod guide than in the middle of it, and so providing the desired nozzle effect that will be explained hereinafter in the discussion of the advantages of the present design.
  • the blade face 122 has a curved surface with a small radius of curvature in the range of 20 to 22 mm.
  • the taper of the surface is defined by a tangent to the curved surface taken in the midpoint of the curve.
  • the angle of the tangent is between 10 and 40 degrees as measured between a line parallel to the longitudinal axis of the rod and the tangent to the curved surface of the blade face 122 .
  • the blade face 122 comprises a curved surface having a small radius of curvature in the range of 20 to 22 mm.
  • the taper of the surface is defined by a tangent to the curved surface taken in the midpoint of the curve.
  • the angle of the tangent is 32 degrees or less as measured between a line parallel to the longitudinal axis of the rod and the tangent to the curved surface of the blade face 122 .
  • the second planar surface (b) has a first predetermined longitudinal length (Lb) parallel to the axis of the rod, the first planar surface (a) and the third planar surface (c) each have a longitudinal length (La, Lc) greater than the longitudinal length (Lb) of planar surface (b).
  • the longitudinal length of the first planar surface (a) and third planar surface (c) is between 55 to 75 mm (preferably 65 mm) and the second planar surface (b) has a longitudinal length of between 0 and 30 mm.
  • the longitudinal length (Lb) of the second planar section 132 b is at least twice a width of the second planar section 132 b.
  • the unitary rod guide 26 , 126 of the present disclosure is molded coaxial about and in fixed contact with the sucker rod 10 .
  • the lead section 34 , 134 is unitary with and molded concurrently with the body 28 , 128 .
  • epoxy based glue (stable to 150 degrees C.) may be placed on the rod 10 and particles having a diameter of between 0.71 and 1.18 mm (preferably 0.8 mm) (sand or synthetic spheres) placed onto the epoxy glue along each section of the rod before the polymeric rod guide 26 , 126 is direct injection molded thereon.
  • the breakaway force provided by the enhanced friction coefficient may be equivalent to the force obtained with direct injection over a rod that has not had such surface preparation.
  • FIGS. 1A and 1B Prior art designs of FIGS. 1A and 1B illustrate transition zones of concave or convex surfaces between blades of rod guides 12 .
  • these transition zones have constant a cross-section along the body portion of the rod guide.
  • constant cross-section geometry if it is assumed that there is zero friction conditions (between the walls of rod guide and the produced fluid), that the produced fluid will move at a constant speed along the passage through the tunnel defined by the rod guide inside of the tubing.
  • the speed profile Begins from 0 to an average value in the center of the rod guide. This effect defines what may be referred to as “the boundary layer”.
  • the boundary layer As the flow velocity decreases, it results in a decrease in the Reynolds number, which results in generating a boundary layer having a lower energization level and therefore more prone to detachment from the surface of the rod guide and tubing. Detachment of the boundary layer produces turbulent areas causing greater inefficient movement of fluid and an increase of pressure drop.
  • the design of the present disclosure includes a variable fluid passage 44 and 144 (a nozzle like configuration) having decreasing cross-sections (from the beginning towards the larger middle section 32 b , 132 b of the rod guide 26 , 126 (see FIGS. 2A , 2 B, 3 , 5 A, 5 B and 6 ).
  • This geometry produces, due to the fact that the flow remains constant, an increase in the average speed (velocity) in the center of the section, that also increases the Reynolds number, and so, the boundary layer results in an increasing speed profile and higher levels of energization, this effect favors to keep the boundary layer adhered to the wall of the rod guide 26 and 126 , and so, there are no turbulent zones increasing the pressure drop in the rod guide.
  • the end section 32 a , 132 a is a stabilization zone, directed to stabilize the speed profile of the fluid, in order to maximize efficiency of the guide.
  • This stabilization zone is needed for a smooth change in the speed profile prior to entering into mid-zone in order to maintain the boundary layer attached to the surface of the rod guide 26 , 126 .
  • the end sections 32 c , 132 c area having a decreasing section allows fluid to slow down and reach the same condition as prior to entering into the flow path 44 , 144 of the rod guide.
  • the rod guide 26 , 126 has a better efficiency regarding the fluid flow and regarding the general pumping system.
  • the tapered surfaces 140 a , 140 b and 140 c are designed to enhance the overall efficiency of the guide due to the “venturi” effect that takes place when the fluid passes through the fluid passage 144 formed between the production tubing (T), and longitudinally tapered surfaces 140 a , 140 b and 140 c .
  • the lateral walls 140 of blades 130 become wider towards the center of the rod guide.
  • the width of the blade 130 is larger in sections 132 b and 140 b than the width in sections 132 a and 140 a , due to the nozzle-like form of the lateral walls of the blades present in this embodiment.
  • the lower pressures over the centralizer due to the bigger erodible area make this centralizer more efficient in terms of life period (decreased rod guide life due to erosion).
  • the design of the rod guide 26 and 126 of the present disclosure has at least the following advantages:

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  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
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  • Extrusion Moulding Of Plastics Or The Like (AREA)
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  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
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US13/280,444 2011-10-25 2011-10-25 Sucker rod guide Active 2033-12-09 US9010418B2 (en)

Priority Applications (10)

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US13/280,444 US9010418B2 (en) 2011-10-25 2011-10-25 Sucker rod guide
CA2792755A CA2792755C (en) 2011-10-25 2012-10-16 Sucker rod guide
CO12189591A CO6930063A1 (es) 2011-10-25 2012-10-24 Guía para varilla de succión
ROA201200754A RO128519B1 (ro) 2011-10-25 2012-10-24 Ghidaj pentru prăjini de pompare şi metodă de realizare a acestuia
ECSP12012278 ECSP12012278A (es) 2011-10-25 2012-10-24 Guía para varilla de succión
MX2012012424A MX2012012424A (es) 2011-10-25 2012-10-24 Guia para varilla de succion.
PE2012002072A PE20131001A1 (es) 2011-10-25 2012-10-24 Guia para varilla de succion
ARP120103981A AR088516A1 (es) 2011-10-25 2012-10-24 Guia para varilla de succion
BR102012027414-0A BR102012027414B1 (pt) 2011-10-25 2012-10-25 guia de haste polimérico para uma haste de êmbolo e processo de instalação
US14/681,818 US9926754B2 (en) 2011-10-25 2015-04-08 Sucker rod guide

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US9926754B2 (en) * 2011-10-25 2018-03-27 Tenaris Connections B.V. Sucker rod guide
US20200040721A1 (en) * 2018-08-03 2020-02-06 Aat Co. Ltd. Central maintenance apparatus of sensor for geophysical exploration
US10738821B2 (en) 2018-07-30 2020-08-11 XR Downhole, LLC Polycrystalline diamond radial bearing
US10760615B2 (en) 2018-07-30 2020-09-01 XR Downhole, LLC Polycrystalline diamond thrust bearing and element thereof
US10968991B2 (en) 2018-07-30 2021-04-06 XR Downhole, LLC Cam follower with polycrystalline diamond engagement element
US11014759B2 (en) 2018-07-30 2021-05-25 XR Downhole, LLC Roller ball assembly with superhard elements
US11035407B2 (en) 2018-07-30 2021-06-15 XR Downhole, LLC Material treatments for diamond-on-diamond reactive material bearing engagements
US11054000B2 (en) 2018-07-30 2021-07-06 Pi Tech Innovations Llc Polycrystalline diamond power transmission surfaces
US11187040B2 (en) 2018-07-30 2021-11-30 XR Downhole, LLC Downhole drilling tool with a polycrystalline diamond bearing
US11225842B2 (en) 2018-08-02 2022-01-18 XR Downhole, LLC Polycrystalline diamond tubular protection
US11286985B2 (en) 2018-07-30 2022-03-29 Xr Downhole Llc Polycrystalline diamond bearings for rotating machinery with compliance
US11371556B2 (en) 2018-07-30 2022-06-28 Xr Reserve Llc Polycrystalline diamond linear bearings
US11603715B2 (en) 2018-08-02 2023-03-14 Xr Reserve Llc Sucker rod couplings and tool joints with polycrystalline diamond elements

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AR095913A1 (es) * 2014-03-27 2015-11-25 Rodolfo Lopez Fidalgo Daniel Unidad de accionamiento de bomba para extracción de agua, petróleo u otros fluidos
US10502007B2 (en) * 2014-08-18 2019-12-10 Halliburton Energy Services, Inc. Composite centralizer blade
AU201812056S (en) * 2018-04-09 2018-05-01 Cobalt Extreme Pty Ltd A rod coupler
AU201815446S (en) * 2018-09-10 2018-10-09 Cobalt Extreme Pty Ltd A Rod Coupler
USD954754S1 (en) * 2020-02-28 2022-06-14 Cobalt Extreme Pty Ltd Rod coupler

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9926754B2 (en) * 2011-10-25 2018-03-27 Tenaris Connections B.V. Sucker rod guide
US11242891B2 (en) 2018-07-30 2022-02-08 XR Downhole, LLC Polycrystalline diamond radial bearing
US10760615B2 (en) 2018-07-30 2020-09-01 XR Downhole, LLC Polycrystalline diamond thrust bearing and element thereof
US11286985B2 (en) 2018-07-30 2022-03-29 Xr Downhole Llc Polycrystalline diamond bearings for rotating machinery with compliance
US10968991B2 (en) 2018-07-30 2021-04-06 XR Downhole, LLC Cam follower with polycrystalline diamond engagement element
US11014759B2 (en) 2018-07-30 2021-05-25 XR Downhole, LLC Roller ball assembly with superhard elements
US11035407B2 (en) 2018-07-30 2021-06-15 XR Downhole, LLC Material treatments for diamond-on-diamond reactive material bearing engagements
US11054000B2 (en) 2018-07-30 2021-07-06 Pi Tech Innovations Llc Polycrystalline diamond power transmission surfaces
US11187040B2 (en) 2018-07-30 2021-11-30 XR Downhole, LLC Downhole drilling tool with a polycrystalline diamond bearing
US11371556B2 (en) 2018-07-30 2022-06-28 Xr Reserve Llc Polycrystalline diamond linear bearings
US11274731B2 (en) 2018-07-30 2022-03-15 Pi Tech Innovations Llc Polycrystalline diamond power transmission surfaces
US11994006B2 (en) 2018-07-30 2024-05-28 Xr Reserve Llc Downhole drilling tool with a polycrystalline diamond bearing
US10738821B2 (en) 2018-07-30 2020-08-11 XR Downhole, LLC Polycrystalline diamond radial bearing
US11970339B2 (en) 2018-07-30 2024-04-30 Xr Reserve Llc Roller ball assembly with superhard elements
US11499619B2 (en) 2018-07-30 2022-11-15 David P. Miess Cam follower with polycrystalline diamond engagement element
US11761486B2 (en) 2018-07-30 2023-09-19 Xr Reserve Llc Polycrystalline diamond bearings for rotating machinery with compliance
US11608858B2 (en) 2018-07-30 2023-03-21 Xr Reserve Llc Material treatments for diamond-on-diamond reactive material bearing engagements
US11655679B2 (en) 2018-07-30 2023-05-23 Xr Reserve Llc Downhole drilling tool with a polycrystalline diamond bearing
US11746875B2 (en) 2018-07-30 2023-09-05 Xr Reserve Llc Cam follower with polycrystalline diamond engagement element
US11761481B2 (en) 2018-07-30 2023-09-19 Xr Reserve Llc Polycrystalline diamond radial bearing
US11603715B2 (en) 2018-08-02 2023-03-14 Xr Reserve Llc Sucker rod couplings and tool joints with polycrystalline diamond elements
US11225842B2 (en) 2018-08-02 2022-01-18 XR Downhole, LLC Polycrystalline diamond tubular protection
US20200040721A1 (en) * 2018-08-03 2020-02-06 Aat Co. Ltd. Central maintenance apparatus of sensor for geophysical exploration

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BR102012027414A2 (pt) 2014-03-18
RO128519B1 (ro) 2022-09-30
PE20131001A1 (es) 2013-10-16
CA2792755C (en) 2020-03-24
MX2012012424A (es) 2013-05-28
US20150252636A1 (en) 2015-09-10
CA2792755A1 (en) 2013-04-25
AR088516A1 (es) 2014-06-18
US9926754B2 (en) 2018-03-27
RO128519A2 (ro) 2013-06-28
BR102012027414B1 (pt) 2021-05-11
US20130098601A1 (en) 2013-04-25
ECSP12012278A (es) 2014-05-31
CO6930063A1 (es) 2014-04-28

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